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6. Probability

The step function and sign function relation:

$$u(t)=\frac{1}{2}[1+\mathrm{sgn}(t)].$$

Discrete step function and Kronecker delta function:

$$u(n)=\sum _{k=-\mathrm{\infty }}^n\delta (k).$$

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5.2. Differentiation in Banach Spaces

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6.1. Random Variables